7a30517cce
There may be some more RCL work to be done (I think I need to split my Z/S
stores when doing separate stencil), but this gets piglit's "texwrap
GL_ARB_depth_buffer_float" working.
v2: Unwrap the z32f_wrapper before calling the helper, rather than having
the helper have a callback.
v3: Rebase on Rob Clark's u_transfer_helper instead